Seismic Response of Superposed Wall Panel with Different Edge Components

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Seismic performance of a kind of superposed wall, which is composed of two precast panels and the cast- in- place core concrete, was studied in the paper. Two groups of superposed wall units with different edge elements were constructed and tested under quasi- static reversed cyclic loading. The strength, stiffness, ductility, energy dissipation and failure modes of the walls under lateral load were investigated, and the influence of different edge elements to the seismic response of the wall panels was discussed. Moreover, numerical simulation analysis was conducted applying multi- spring (MS) model with the finite element analysis procedure CANNY. Results of the inelastic analysis were compared with the experimental ones to validate the reasonability of the numerical model and evaluate the seismic response of superposed walls further.

Abstract: Combined with the structural design of left-shore drainage aqueducts in China South-to-north Water Transfer Project, the structure of cast-in-situ reinforced concrete flume (RCF) with wide and shallow drainage section superposed on longitudinal precast prestressed concrete beams (PPCBs) was drafted. The 3D finite element models were built to study the normal service behaviors of the aqueduct with or without segregating asphalt layer between RCF and PPCBs. The results show that the segregating asphalt layer changes the structural compositions of aqueduct subjecting water loads and results in some effects on loading capacities of the PPCBs and the RCF, such as the larger displacement and tensile stress of PPCBs, the many longitudinal sections of subplate in whole tensile state with larger tensile stresses and the larger vertical tensile stresses at internal surface of sidewall. It provides valuable reference for designing the same kind of aqueduct.

Abstract: In this article, the waterproof curtain, the underground diaphragm wall and the soil between them are regarded as superposed combined exterior protected structure, then build a flexible spring support system. When using senior ANSYS finite element analysis program to simulate the strained condition and displacement of the underground diaphragm wall, we will combine with the monitoring result and the result of traditional comouting method. After contrasting, we can get a conclusion: the strained condition and displacement of the wall of this simulation method are more coincident with practical projects, and can reduce unnecessary waste.

Abstract: To improve the flexural properties and lighten the weight of ordinary reinforced concrete beam (RCB), this paper develops a new type of superposed RCB in which the tensile zone was partially cast with the steel fiber reinforced full-lightweight concrete (SFRFLC). 10 beams with different height of SFRFLC were designed. Their flexural behaviors were measured including the concrete strain at mid-span cross section, the load vs deflection curve, the cracking load and the ultimate load. It may be concluded that the test beams damage in ductile, the concrete strains at mid-span cross section basically fit the assumption of plain cross section, the variations of load vs deflection curves are similar with obvious changes at the points of the cracking of concrete and the yield of tensile reinforcements, the cracking loads are almost equal, and the ultimate loads tends to decrease with the increasing height of SFRFLC. The SFRFLC and ordinary concrete work well together, the suitable height of SFRFLC is there should be further studied.

Abstract: This paper introduces the test results of eight steel fiber reinforced lightweight aggregate concrete (SFRLAC) superposed two-way slabs under punching load. The tensile and compressive zones of the slabs were cast with the SFRLAC and the ordinary concrete respectively. The slab was simply supported along the four edges under central concentrated load on the short column. The main parameter of SFRLAC was the fraction of steel fiber by volume of 0.8%, 1.2% and 1.6%. The measurements were made such as the deflection, the strains of steel bar and concrete, the crack distribution, the loads corresponding to the yielding of steel bar and the ultimate state. It proved that the punching resistance of SFRLAC superposed two-way slab increased about 51%~78% with the increasing fraction of steel fiber by volume, the ability to resist punching deformation was enhanced remarkably, many fine cracks distributed on the tensile surface, and the ductility at failure state increased to a certain degree.